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Revert massive replacement of empty list creation sentences. The use of '[list]' instead of '{}' adds semantics that could be used for performance improvements in the future, such as using a different internal representation. There is already work in this direction, avoiding the generation of the string representation during comparison of empty strings (huge thanks to Stefan Sobernig for the pointer: https://core.tcl.tk/tcl/info/44527c632ed609c2).

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Prefer '{}' to '[list]' when creating empty lists

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Fixed problem with generation of the JSON Activity Tree from the manifest.

Big upgrade to the scorm 2004 stuff ...

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Made the SCORM stuff from ilias honor the optional xml:base tag which may

be specified in a resources or resource tag. Not only does this make our

port of their stuff more compliant, but it simplifies the integration of

assessment.

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Added catalog and one catalog file for the "duplicate course" error message.

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    ./catalog/scorm-core.en_US.ISO-8859-1.xml
Major shuffling of stuff, some datamodel corrections, improved error

handling (dupe course gives error), bombed course uploads rollback, etc.

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    ./sql/postgresql/object-types-create.sql
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    ./sql/postgresql/object-types-drop.sql
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Fixed my sample tree query ...

Modified tree to simplify it and provided a comment with a couple of

query examples.

Removed ilias user table.

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    ./sql/postgresql/scorm-datamodel-drop.sql
Core datamodel and utilities for a new Scorm 2004 player based on the ilias

runtime environment implemented in JavaScript rather than Java.Z

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    ./sql/postgresql/object-types-create.sql
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    ./sql/postgresql/object-types-drop.sql
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    ./sql/postgresql/scorm-core-create.sql
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    ./sql/postgresql/scorm-datamodel-drop.sql
Initial revision

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    ./sql/postgresql/object-types-create.sql
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    ./sql/postgresql/object-types-drop.sql
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    ./sql/postgresql/scorm-core-create.sql
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    ./sql/postgresql/scorm-core-drop.sql
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    ./sql/postgresql/scorm-datamodel-create.sql
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    ./sql/postgresql/scorm-datamodel-drop.sql
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    ./tcl/scorm-core-init.tcl
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    ./tcl/scorm-core-procs.tcl
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    ./tcl/scorm-core-procs.xql
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